NAME

       podman-unshare - Run a command inside of a modified user namespace

SYNOPSIS

       podman unshare [options] [command]

DESCRIPTION

       Launches a process (by default, $SHELL) in a new user namespace. The user namespace is configured so that
       the invoking user's UID and primary GID appear to be UID 0 and GID 0,  respectively.   Any  ranges  which
       match  that  user and group in /etc/subuid and /etc/subgid are also mapped in as themselves with the help
       of the newuidmap(1) and newgidmap(1) helpers.

       podman unshare is useful for troubleshooting unprivileged operations and for  manually  clearing  storage
       and other data related to images and containers.

       It  is also useful to use the podman mount command.  If an unprivileged user wants to mount and work with
       a container, then they need to execute podman unshare.  Executing podman  mount  fails  for  unprivileged
       users unless the user is running inside a podman unshare session.

       The unshare session defines two environment variables:

              • CONTAINERS_GRAPHROOT: the path to the persistent container's data.

              • CONTAINERS_RUNROOT: the path to the volatile container's data.

       IMPORTANT: This command is not available with the remote Podman client.

OPTIONS

   --help, -h
       Print usage statement

   --rootless-netns
       Join the rootless network namespace used for netavark networking. It can be used to connect to a rootless
       container via IP address (bridge networking). This is  otherwise  not  possible  from  the  host  network
       namespace.

Exit Codes

       The  exit  code  from  podman  unshare  gives information about why the container failed to run or why it
       exited.  When podman unshare commands exit with a  non-zero  code,  the  exit  codes  follow  the  chroot
       standard, see below:

       125 The error is with podman itself

       $ podman unshare --foo; echo $?
       Error: unknown flag: --foo
       125

       126 Executing a contained command and the command cannot be invoked

       $ podman unshare /etc; echo $?
       Error: fork/exec /etc: permission denied
       126

       127 Executing a contained command and the command cannot be found

       $ podman unshare foo; echo $?
       Error: fork/exec /usr/bin/bogus: no such file or directory
       127

       Exit code contained command exit code

       $ podman unshare /bin/sh -c 'exit 3'; echo $?
       3

EXAMPLE

       Execute specified command in rootless user namespace:

       $ podman unshare id
       uid=0(root) gid=0(root) groups=0(root),65534(nobody)

       Show user namespace mappings for rootless containers:

       $ podman unshare cat /proc/self/uid_map /proc/self/gid_map
                0       1000          1
                1      10000      65536
                0       1000          1
                1      10000      65536

       Show rootless netns information in user namespace for rootless containers:

       $ podman unshare --rootless-netns ip addr
       1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
           link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
           inet 127.0.0.1/8 scope host lo
              valid_lft forever preferred_lft forever
           inet6 ::1/128 scope host
              valid_lft forever preferred_lft forever
       2: tap0: <BROADCAST,UP,LOWER_UP> mtu 65520 qdisc fq_codel state UNKNOWN group default qlen 1000
           link/ether aa:8c:0b:73:98:f6 brd ff:ff:ff:ff:ff:ff
           inet 10.0.2.100/24 brd 10.0.2.255 scope global tap0
              valid_lft forever preferred_lft forever
           inet6 fd00::a88c:bff:fe73:98f6/64 scope global dynamic mngtmpaddr
              valid_lft 86389sec preferred_lft 14389sec
           inet6 fe80::a88c:bff:fe73:98f6/64 scope link
              valid_lft forever preferred_lft forever

SEE ALSO

       podman(1), podman-mount(1), namespaces(7), newuidmap(1), newgidmap(1), user_namespaces(7)

                                                                                               podman-unshare(1)